How many way i can smooth my Mesh?
There are several tools you can use to smooth out edge loops.


Use the Smooth Vertex tool (Ctrl + V, Smooth Vertex).
Use the Relax tool (W, Relax).
Use the Curve and/or Relax tools from the LoopTools addon that comes
with Blender.
Use proportional editing (O).
Use a Smooth or Laplacian Smooth modifier.
Use a Subdivision Surface modifier (this will add new geometry to the mesh).